采用可编程逻辑控制器的大型物体三维扫描重建

本文提出了一种新颖且实用的三维重建系统,以获取大型物体的三维数据。文中对该系统的组成以及所采用的方法和原理进行了研究。该系统由一个基于红外的三维扫描仪、两个导轨和一个基于PLC(可编程逻辑控制器)模块的高精度运动控制系统组成。运动控制系统控制安装在导轨上的三维扫描仪做匀速运动;三维扫描仪向物体投射红外线,并重建物体上所投射的红外线段;接着,系统根据三维扫描仪的运动速度,拼接局部重建数据,最终获得大型物体完整的三维重建数据。实验结果表明:与基于激光测距拼接的方法相比,该方法的测量速度约提高了7倍,测量精度约提高了2.5倍。基本满足工业生产中大型物体自动三维重建的稳定可靠、精度高、速度快等要求。

3D scanning and reconstruction of large objects based on PLC

An innovative and practical 3D reconstruction system was proposed to obtain 3D data of large objects, and the system composition, theory and method were researched.The system is composed by an infrared-based 3D scanner and two guide rails and a high-accuracy motion control system based on Programmable Logic Controller (PLC) module.First, the 3D scanner installed in the guide rail was controlled by the motion control system to move at a constant speed;then,the 3D scanner was used to project infrared ray towards the object and reconstruct the infrared segment projected;finally, based on constant motion speed of the 3D scanner, the system was used to merge the local reconstruction data, thus obtaining complete 3D reconstruction data of the large object.Experiment result indicates that compared with the method based on laser ranging, measuring speed achieved by using this proposed method is improved by approximately 7 times, with a measurement accuracy improved by about 2.5 times.The proposed method can basically satisfy the requirements, such as high reliability, high accuracy and high speed, for auto 3D reconstruction of large objects in industrial production.